J/A+A/397/257 Chemical compositions of four barium stars (Liang+, 2003)
Chemical compositions of four barium stars.
Liang Y.C., Zhao G., Chen Y.Q., Qiu H.M., Zhang B.
<Astron. Astrophys. 397, 257 (2003)>
=2003A&A...397..257L 2003A&A...397..257L
ADC_Keywords: Stars, barium ; Binaries, spectroscopic ; Equivalent widths ;
Abundances, peculiar
Keywords: stars: abundances - atmospheres - chemically peculiar - evolution -
binaries: spectroscopic
Abstract:
Chemical compositions of four barium stars are studied.
We obtain their α, iron peak and neutron-capture (n-capture)
process element abundances. The atomic data and measured equivalent
widths (EWs) of the related spectral lines are given. The abundance
errors caused by the combined effects of the uncertainties in
oscillator strengths loggf-values, equivalent widths (EWs) and stellar
atmospheric parameters (e.g. effective temperature Teff, surface
gravity logg, and microturbulent velocity {xit}) are the total
abundance uncertainties. The individual and total abundance
uncertainties caused by these factors are given.
Objects:
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RA (2000) DE Designation(s)
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04 14 58.8 -00 59 51 HD 26886
04 18 33.8 +02 28 14 HD 27271
06 51 54.0 +06 36 25 HD 50082
11 22 49.6 +43 28 58 HD 98839
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 70 134 Atomic data and EWs of lines in four stars
table5.dat 55 73 Abundance uncertainties
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambda Wavelengths of line
12- 16 A5 --- Ion Atomic element of line
19- 22 F4.2 eV chi Excitation potential of line
26- 30 F5.2 --- loggf Oscillator strengths of line
32- 33 A2 --- r_loggf The reference sources of n-capture elements (1)
36- 38 I3 0.1pm EWs(1) ? Equivalent widths of lines in star HD 26886
43- 45 I3 0.1pm EWs(2) ? Equivalent widths of lines in star HD 27271
50- 52 I3 0.1pm EWs(3) ? Equivalent widths of lines in star HD 50082
57- 59 I3 0.1pm EWs(4) ? Equivalent widths of lines in star HD 98839
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Note (1): References:
h : Hannaford et al., 1982ApJ...261..736H 1982ApJ...261..736H
b : Biemont et al., 1981ApJ...248..867B 1981ApJ...248..867B
wm: Weise & Martin, 1980, NSDRS-NBS 68
lb: Luck & Bond, 1991ApJS...77..515L 1991ApJS...77..515L
b2: Biemont et al., 1982A&A...107..166B 1982A&A...107..166B
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 14 A5 --- Ion Atomic element in the star
19- 22 F4.2 --- sigma(EW/sqrt(N)) Abundance errors caused by EWs values
25- 29 F5.2 --- Delta(Teff) Abundance errors caused by increasing
100K in effective temperature
32- 36 F5.2 --- Delta(logg) Abundance errors caused by increasing
in surface gravity (1)
39- 43 F5.2 --- Delta(xit) Abundance errors caused by increasing
0.3km/s in microturbulent velocity
45- 49 F5.2 --- sigma(tot) Total abundance errors caused by the
combined uncertainties in gf-values,
EWs and stellar atmospheric parameters
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Note (1): The increasing in surface gravity is of
0.3 for HD 26886,
0.2 for HD 27271 and HD 50082,
0.1 for HD 98839.
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Acknowledgements: Yanchun Liang ,
(End) Patricia Bauer [CDS] 14-Oct-2002